Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81ad6371b087efb…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 170df171b586a5a63a373f64f2040cf2 SHA-1: 257009a6d34f39cad5eca93af70113d2b62e4c2d SHA-256: d81ad6371b087efbfbb3c6cd4e1026059047c1aab4cd00b24f049a6e102f3e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.farmaciapenil.es/userfiles/files/mosomivepevilelosedimeg.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/658b7caa7d3d4f868f1df916e9ceb581/97296137279.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40327656121.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/910a258df3afc354a60a3511c74c6e5a/zukesojodibebufigatala.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nsp0hl6t5i3meohfuetlm2ti43/jajamagegome.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6acb4a621---71787592029.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/34122358449.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/41563663938.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tta1uc3ce7fdu750g1pdb1gfvn/4554014154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b8f58c13---87620753705.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/xopuzipiwux.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///46658407066.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/23854336590.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/gupugosugobisomogi.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/suditedasawozefozonole.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/gimowokimuxul.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070118035225.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/burukudukofasewuvegi.pdfIn PDF document text
    • https://codecs.roimages/file/kewafobinabokovopabinov.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff80acb64---tawebagesobujuvujituxape.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/84213201763.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096858254cae---90010515270.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/71405171132.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b3f6db1b---simisugasudiwemesepowezig.pdfIn PDF document text
    • http://distributoram.com/files/file/gobogifipivebuwep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jerome+bruner+play+theoryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 18532 bytes
SHA-256: c31c91e6058de01e902329c46506a9fb40d5d7bfc47864e6d1c64448ac966819
font_01_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B37 10604 bytes
SHA-256: 9db88ca8d471b9de8732dac8d62f10dd03a447550ea7d8c8b4ac67b74aa48e3f

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